LIGHTING SYSTEM > Back-up Light Circuit

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DESCRIPTION

The HV control ECU receives shift position R signal and controls the back-up light relay. The back-up light relay installed in the power distributor.
System diagram of the power distributor (Click here).
System description of the power distributor (Click here).

WIRING DIAGRAM


B110617E02


INSPECTION PROCEDURE

1.CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    B110618E01

  1. Disconnect the connector from the J/B No.2 (power distributor).

  1. Measure the voltage according to the value(s) in the table below.

    Voltage:
    Tester connection
    		Condition
    		Specified value
    BUB (2F-3) - Body ground
    		Ignition switch ON
    		10 to 14 V
    BUB (2F-3) - Body ground
    		Ignition switch OFF
    		Below 1 V



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


2.CHECK MODE MONITOR TERMINAL (BACK-UP RELAY)


    I037287E01

  1. Preparation

    1. Connect the connector.

    2. Remove the cover of the fusible link block assembly.

    3. Set the vehicle to the following condition.

      1. Ignition switch ON.
      2. Shift in R position.

  1. Check voltage

    1. Measure the voltage between the Mode Monitor Terminal and body ground.

      Voltage:
      Result
      		Proceed to
      0 V or Approx. 12 V
      		A
      Approx. 6.2 V
      		B
      Approx. 2.0 V
      		C



B
Go to step 5

C
Go to step 9
A


3.CHECK HARNESS AND CONNECTOR (J/B NO. 2 - MODE MONITOR TERMINAL)


    E111537E01

  1. Disconnect the 2G connector from the J/B No.2.

  1. Measure the resistance according to the value(s) in the table below.

    Resistance:
    Tester connection
    		Condition
    		Specified value
    2G-5 - Mode monitor terminal
    		Always
    		Below 1 Ω
    2G-5 - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.CHECK HARNESS AND CONNECTOR (J/B NO.2 - BODY GROUND)


    B113765E01

  1. Disconnect the connector from the J/B No.2.

  1. Measure the resistance according to the value(s) in the table below.

    Resistance:
    Tester connection
    		Condition
    		Specified value
    2H-13 (SGND) - Body ground
    		Always
    		Below 1 Ω



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.INSPECT JUNCTION BLOCK NO.2 (BACK-UP RELAY)

  1. Turn the ignition switch to OFF position.

  1. Remove the J/B No.2.



  1. Inspect the back-up relay.


    I037289E03

    1. Connect the positive battery lead to terminal BUB of the J/B No.2 and the negative lead to terminal SGND, PGND.
      Symbols (terminals No.)
      		Connection
      BUB (2F-3) - SGND (2H-13), PGND (2F-1)
      		Positive - Negative

    2. Measure the voltage according to the value(s) in the table below.

      Voltage:
      Tester Connection
      		Specified Condition
      BUL (2E-1) - SGND (2H-13)
      		0 V

    3. Connect the battery positive lead to terminal BKR of the J/B No.2.
      Symbols (terminals No.)
      		Connection
      BKR (2G-7)
      		Positive

    4. Measure the voltage according to the value(s) in the table below.

      Voltage:
      Tester Connection
      		Specified Condition
      BUL (2E-1) - SGND (2H-13)
      		10 to 14 V



NG
REPLACE JUNCTION BLOCK NO.2
OK


6.CHECK HARNESS AND CONNECTOR (J/B NO. 2 - HV CONTROL ECU)


    E111715E03

  1. Disconnect the connector from the J/B No.2 (power distributor) and HV control ECU.

  1. Measure the resistance according to the value(s) in the table below.

    Resistance:
    Tester connection
    		Condition
    		Specified value
    2G-7 (BKR) - H30-29 (BL)
    		Always
    		Below 1 Ω
    2G-7 (BKR) - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


7.CHECK HARNESS AND CONNECTOR (J/B NO. 2 - BULB)


    E111716E01

  1. Disconnect the connectors from the J/B No.2 (power distributor) and back-up light bulbs.

  1. Measure the resistance according to the value(s) in the table below.

    Resistance:
    Tester connection
    		Condition
    		Specified value
    2E-1 (BUL) - B14-2 (Back-up light LH)
    		Always
    		Below 1 Ω
    2E-1 (BUL) - B15-2 (Back-up light RH)
    		Always
    		Below 1 Ω
    2E-1 (BUL)- Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


8.CHECK HARNESS AND CONNECTOR (BULB - BODY GROUND)


    B110619E01

  1. Measure the resistance according to the value(s) in the table below.

    Resistance:
    Tester connection
    		Condition
    		Specified value
    B14-1 (Back-up light LH) - Body ground
    		Always
    		Below 1 Ω
    B15-1 (Back-up light RH) - Body ground
    		Always
    		Below 1 Ω



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

9.CHECK HARNESS AND CONNECTOR (SHORT CIRCUIT DRIVEN SIDE BY RELAY)


    B110620E01

  1. Preparation

    1. For easier disconnection, remove the J/B No.2 and then take apart the connectors.

    2. Disconnect only the connector "2E" .

  1. Check voltage

    1. Measure the voltage between the Mode Monitor Terminal and body ground.

      Voltage:
      Result
      		Proceed to
      Approx. 6.2 V
      		A
      Approx. 2.0 V
      		B



B
REPLACE JUNCTION BLOCK NO.2
A

REPAIR OR REPLACE HARNESS OR CONNECTOR (SHORT CIRCUIT BETWEEN BACK-UP LIGHT AND J/B NO. 2)